Focusing mechanism for lighting units



Jan. 27, 1931. o. WERNER FOCUSING MECHANISM F'Ofi L I GHTING UNITS 2 Sheets-Sheet 1 Filed July 14, 1928 INVENTOR Oscar Werner.

ATTbFNEY I Jan. 27, 1931-. o. WERNER FOCUSING MECHANISM FOR LIGHTiNG man's Filed July 14. 1928 2 sheets-sum La 2/ Fig. 2. 23

} INVENTOR Oscar Werner;

ATTCIJRNEY Patented Jan, 27, 1931 elmmrec unme commune onc ss on F"IE.1\T1\I$YLVANIA a Application iuedvm 14,

willillyiinyelition relates to illuminating lde- -a7icesand more particularly to focusing V mcans for floodlightsand, similar appara u lt is among the objects-cf-my inventionto Pr vi e .id vic r. 1ofr i chara t whifi shall be capable of positive, convenient and j :cxactuniversal:adjustability in reference to a reflector or its'focal point.

flt; is a further object of my, inventlon to noep ui e u h' an en los r ofzth i p t n and delicately responsive to adjustment, and

in which the'adjustmentofa single screw .agofv produces only a singlemovem n Of lamp .inL-a .n ar y= t a g n --a -m i a 2mpoundrmoyement' r I r v,

A still further object of my inventionls to -provide adevice of the above-mentioned 25 \Qharac-ter such thatthelamp cannotibe forcibly moved against thereflector and broken. :l zpreet ing myin n eniin co ne i i iththe:fl o flig ng i 9irth ius yp I V I provide a base member having thrfifigscrews eonthreedejd th re r ug v 1 :p v de ei la p r supp rt-p y un ednne e en r ei-two Q -iil screws a h v ng I W i W weir ly .ertendi gvperfions; 118 -Of.-;Whi c h supports h l mp A sp ng plura ty v.- :...='-T 1 i? spring iszdi p d be e as and the lamp support :to' biasgthe lan psupport" awayf rom the base and aibell-crank ispi-yotsally mbuntedonthe base in such a manner .7 ethat cnc arm of the bell-cra'nk is pivctally -;qecea unusn,ior s vmmm mDreNe'aS euQR-iwo WES INGHOUSE-aircrew Fig; 3 is a f diit ele ational view" of I the focusingmechanism;

Fig.4 is a rear elevational View of the'fo cusing mechanism'; and V o 1 .-Z

' ig. 5 is aschematic diagram showing the 'Loperation of, thefocusing mechanism;v v

,Referringlmore particularly to Fig. 1; my i device is adapted to befmountedin the-usual 'flood-lighting unit 'comprisinga base member l to gwhich'a yoke member'2 is slid ably ;at

.tachedbymeansof a-bolt 3,;and washer L The yoke-member is adapted to engage the :projectOr housing 5' at the sides thereof at diametrically opposedpoin'ts. The usual reflQ ZQL member 61 isfastened within'th e hous- ,1

ingby-bolting it to v a suitable fiangeinember '7 onjthe inside of-the-h-ousinga Ajdooror cover 8, in,whichis fastened -a lens 9 is pro- .Vided which, -;by:' reason ;of resilient; sealing means l1 and 12', issadapted. to maintaina My f ocusll lg mechanism is mounted in "an upwardly-extending chamber 13 .ofzthe housng, 'The base ofthe focusing mechanism -c omp r1ses a basegplate 15 V-rprovidedwith. a;

lfiange lfi adapted to engage and covera coactmgJflaIigQl'T:omthezprojector housing and thei base plate ,is rsecjured to the housing flange by means of bolts 18. .7 i l ;focus ing mechanism maybest be ex- .plained by reference to the-diagrammatic per- 770 WfltQE-fiight closure of the proj ector housing.

spectiueyiewshowniinFig. 5. .Thebase 15'i's l-provided'with" three triangularly disposed i 1adj-usting screwsfll,22 and 23, upontwo of .whichis pivotally mounted the "lamp support .1

tending portions25 andj 26. Oneofthe down-, f

Wardly' extendingportions 25 constitutes a mOllnting' for the glampc jsocket '27 ;and lamp z eng ged =w th'thethird screw nd th O h 1 cusing mechanism shown in Fig. l;

.28ywhile the 0the'r,-; 26, constitutes whati mayf .a ,v zdi p to b ega nstene'ro sth e b 't m ibe'.r p t y'f h w i downwardlyextendingportions,of the lampj uisrhereinafiterexplained. p; 7 v} s uppopt a: v 1fllwo springsiiwOjandBl arelccated between- .1Refcrringvn1ore particularly tofithe dra-wthe baseliand the lamp support 24 and are g i fi r i di t likepa-rtsi -.edapted-to;force it outwardly about-the ends: l-ig r l e t on l w Q ligh 0f i s ..lne' w 2131 Ze P VQt; a illg :llnit withmy .focusing -me chan ism' ;A bellcrank lever32'ispivotally mounted "amounted h r r -ithe as ns evm lm ri to r E'g flis a-side-el vational y 'ewnfofthe foabuts against ;t;he"bea ring plate 26 vofthe ;lamp;.supp9rti i h .1 the ot er arm Beef the U adjustment of screws 21 and 22 insopposite direction but identical in idegree results in lateral movement of the lamp ofnly lflThis' v gagement of arm 33 andbearingplate 26 is y,

bell crank is movablyengaged to the end of the focal adjustment screw 23.

It may be readily understood that vertical adjustment of screws 21 and 22 in the same direction and identical in degree, results in a vertical movement only ofthe lamp 28 in a plane parallel to the'refiected rays, while lateral movement, because of thelsliding' en asimple movement and not a compound one.

This means'that a focal-adjustment, 01166986?- cure'd, is not materially affected by lateral "or by vertical motion of the lamp; m

, Focusing of the lamp'by movement inland out 'parallel'to the reflected rays "with 're ference to the reflector is accomplished b movement of the focal adjustment screw 23, Thus,

the operator when replacing lamps can, by the manipulation of screws 21 and 22 soadjustthe lamp vertically and laterally that its filamentis in the center axis of 'the'refle'ctor without materially affecting the focal dis tance of the lamp with reference to thereflector, since this focal adjustment is controlled solely by the adjustment 'ofj-screw;23 regardless of the pos'itionof screws 21 and 22.

By reference to Fig.- 5," it maybe readily understood that amovement ofscrew 21 or screw 22, while the lamp support 24 isin a horizontal position, results'in only a simple circular movement of thelamp, since the bearing plate 26 slides from side to side' 0n the bell-crank arm '33. Also, if the lamp support is inv ahorizontalplane,movement of the screw 23 results in a simplecirculanmoright, in accordance 'withthe adjustment of and 22. w 1

The movement of the lamp for focusing is usually'not more than an inch or so in space,

than the desired direction would not amount to more than movement in an undesirabledi-V =rect1on of the order of one-sixteenth of an I .If, in focusing the lamp,'it strikesthere- "bearing plate 26 and 'the""lamp Iis pressed against the reflector: only by forceof the springs30 and 31, The springs30and131 are n I of such dimensions that they are not strong Referring *more particularly '7 to i it is desirable that the lamp support 24 and the enough to breakthe lamp bell crank 32 he so pivoted On the adjusting screws that a full bearing surface be presented at all times and also so that the motion of one part on the other will be a smooth rocking motion rather than an irregular tilting motion, such as would result if the lamp support and :bell crank rested directly on 'collars'35 of the adjusting screws. W In my preferred structure the collars35 are fastened at the lower ends of theadjusting 'EiiGW byffiiealisjof cotterpins Concave depres'si0ns'37ar'e provided in the c ollarsand a-hemispherical washer 38 is adapted to be fitted intothe concave depression of the collar ,so-thatia-jsuitablyadapted member of the focusing mechanism, such as thelamp support 24, issl idabl-y engaged with the upper surface ofthe hemispherical washer 38, and by reason 7 "of the movement of the hemispherical washer ,38 on thecollar 35 "will have a full bearing surface at all times with adjusting screws. g a 3 In the event that the lamp is permitt'ed to be moved back againstthe'reflector,the bellcrank ismoved away from-the depending portion of the lamp support and thelamp is' permitted to rest against the reflector and to be held against it only by the pressure exerted by the two springs, which pressure is -insufiicient tobreak the lampbulb.

The threeadjusti'ng screws 21, 22 and23 are 'the only projecting portions of the focusing mechanism and since they are closely engaged with the base and the base ispro'vided with up'w'ardly extendingbos'ses' 39 surrounding ithe threevscrews, moisturecannot enter at this point. It is not necessary to'remo've thedoor in order to focusthe lampsan'd therefore since 0 N the housing is tightly closed at all times, extion of the lamp from'right to left, o r'-left to cept when replacing the lamp, very little dust and moisture is';permitted to enter the interior of the projector housing.

I The focusing mechanism -1s 1 s mple and the collars ofthe:

sturdy and permits a universal adj ustment'of the lamp.

' Although I-have described a specific madifi- *eationef myinvention, I' do notwishto be so that the compound movement,-in case the lamp support2 l is not in a horizontal plane,

may be ignored, as such movement in-other 50 limited thereto-since variousmodifications may be made'by'those skilled-in the artfwithj outdepartingfrom the spirit and scope of my invention asset forth in the'append'edclaifn'sJ I; claim as'my'invention I In lighting fixture, the coniliination with a substantially fixed basefa lamp andfa support therefor, of a plurality'fof adjusting screws upon twoof whichfthe support is piv-' otally mounted spring meansdisposed be ntw'een base and support to bias thej'suppo'rt about the two first-named adjustingfscrews and a'bell crank lever p'ivoted'onflthe ba'se,one-

support about the two first-"named adjusting screws against the biasing action of the'spring means.

1 2. In a light fixture, the combinationwith a substantially fixed base, a lamp and a support therefor, of a pair of spaced adjusting screws extending through the base andv pivotally 'co nnect'ed to the support, a pair of spaced compression springs extending between the base and the support, the adjusting screws and the springs being located in parallel-extending parallel planes, a bell-crank lever pivotally mounted on the base and having one end operatively engaging the support, and a 7 third adjusting screw extending through the a base and pivotally connected to the other end P of the lever. r V 3. Ina light fixture, the combination with a substantially fixed base having threescrews 1 extending through the base, a lamp support pivotally mounted on the lower ends of two of the screws and having two downwardly extending portions, one of which supports the lamp, a spring disposed between the base and V lamp support and a bellcrank pivoted on said base, one arm of whichispivotally engaged V by the third screw and the other arm of which is disposed to abut against one of the downwardly extending portions of the lamp support. V

v 4. In a lighting fixture,'a focusing device therefor including a' base, three adjusting screws, a lamp, a lamp support, including a plate, a spring disposed between the base of the lighting fixture and the lamp support, the

lamp support being tiltably mounted on two of the screws and biased-away'from the base by the spring and .means operable by the third adjusting screw and having sliding engagement with a face of the plate to move it v against the biasing action of the spring. I F In testimony whereof, I have hereunto sub-' Y 40 scribed my name this 10th day of July, 1928; i V

OSCARWERNER. Y 

